Danny Garcia, Sergio Martinez, and Amir Khan all won as expected on Saturday, but each of them was pushed by their underdog opponent in a series of entertaining fights.

It's a busy weekend for the sport of boxing, with Sergio Martinez returning to Argentina for the first time in 11 years, Zab Judah and Danny Garcia kicking up dust in Brooklyn, and Amir Khan in action in the UK.

Nonito Donaire was the A-side, but Guillermo Rigondeaux pulled off the upset, winning a 12-round unanimous decision in the HBO boxing main event.

It's a clash of elite talents tonight at Radio City Music Hall as Nonito Donaire faces Guillermo Rigondeaux in a highly-anticipated super bantamweight title unification fight.

Smaller fighters such as Nonito Donaire haven't often been HBO headliner spotlight, but the Filipino-American has become a star over the past five years. Tomorrow, he faces perhaps his toughest foe to date, Cuban amateur legend Guillermo Rigondeaux.

Manny Pacquiao is set to pull in some very serious money for his fight with Juan Manuel Marquez. Top Rank is saying Manny will get more than $25 million for the fight.

A video preview of the battle between Julio Cesar Chavez Jr. and Sergio Martinez. The two men fight this Saturday night on HBO pay-per-view.

The story of the circumstances that led to Canelo Alvarez vs. Josesito Lopez and Julio Cesar Chavez Jr. vs. Sergio Martinez taking place on the same night on competing networks.